F - Mech Eng,Light,Heat,Weapons – 25 – D
Patent
F - Mech Eng,Light,Heat,Weapons
25
D
62/39
F25D 21/12 (2006.01) F25B 5/02 (2006.01) F25B 47/02 (2006.01)
Patent
CA 1062927
REFRIGERATION SYSTEM UTILIZING SATURATED GASEOUS REFRIGERANT FOR DEFROST PURPOSES ABSTRACT OF THE DISCLOSURE A system for refrigerating food products utilizes a saturated gaseous refrigerant, commonly called "cool gas" for defrosting an evaporator or set of evaporators. When defrost is to occur, the saturated gaseous refrigerant flows from a receiver through the evaporator or set thereof being defrosted. A differential pressure control switch operates to prevent flow of refrigerant to the receiver from the liquid supply line through which said refrigerant normally flows from the condenser to the evaporators. The flow from the liquid line to the receiver is prevented whenever the pressure in the liquid line exceeds the pressure in the receiver by a predetermined value. Accordingly, if liquid in the receiver is fully evaporated in providing saturated gaseous refrigerant for defrost purposes, and the pressure in the receiver is less than in the liquid line and causes the flow of liquid from the liquid line to the receiver to be closed off by operation of the differential pressure switch, the defrosting operation switches automatically from cool to hot gas as a response to the depletion of the cool gas supply. -1-
300393
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